Design And Experimental Study Of Water Flow Power Generation Device

In order to study the feasibility of applying residual pressure power generation technology to the power generation of miniature high-pressure water impact turbines,this project was carried out.In addition,the efficiency of the buckling strength and energy of the turbine under different rotor diameter sizes,vane notch shapes,and different flow rates and pressure differences are studied.The high-pressure water column that plays an important role in the field of oil and gas drilling engineering is used for hydropower generation design.A miniature high-pressure water bucket impact turbine and its high-pressure test platform are designed.With reference to the design ideas of traditional water bucket turbines,a new embedded high pressure water bucket impact turbine for high pressure water injection pipeline sections of oil drilling is proposed.This subject uses research methods such as finite element analysis,structural mechanics,fluid-structure interaction,and prototype experimental verification.According to the actual working parameters of high-pressure water injection pipelines for oil drilling,a new embedded high-pressure water bucket impact turbine is designed.Optimize the design of turbine guide vanes,guide vane runner size,nozzle design and other components.First,based on the actual field conditions of traditional bucket-type turbine design and research topics,and combined with structural mechanics research methods,preliminary design of the dimensions of each component of the turbine.In addition,determine the number of nozzles and guide vanes.Second,the research methods of fluid-structure coupling and finite element analysis were used to explore the buckling strength characteristics and energy efficiency of turbines under different runner diameters and vane notch shapes.Finally,based on the previous theoretical research,an embedded miniature high-pressure water bucket impact turbine and its high-pressure test platform are designed.By adjusting the velocity of the inlet jet and the pressure difference between the inlet and outlet of the pipe,the energy collection efficiency of the turbine at different speeds and pressure differences was compared.The test data of the device is compared with the computer calculated data.The first point is to verify the feasibility of the theoretical research scheme.In addition,the feasibility of applying residual pressure power generation technology to micro-high pressure water impact turbines for power generation.In this paper,a new type of high-pressure water-impact power generating turbine applied to oil and gas drilling engineering is the main research object.Under the given hydraulic conditions of the turbine,finite element modeling,flow analysis and buckling analysis are performed.Based on this,the characteristics of the high-capacity hydropower generating device under different structural parameters design were obtained.This article focuses on the following three aspects:?1?Flow regime analysis.This subject uses the methods of jet impact model,fluid mechanics theory,optimal dynamic model theory,and two-dimensional geometrical force analysis theory.Derive and calculate the calculation formula of impact force F and flow rate Q when high pressure water impacts the inner surface area of the impeller.The theory reveals the influence of high-pressure water flow incident angle,hydraulic efficiency and internal energy loss coefficient of turbine blades.The theory reveals that the inlet jet diameter is related to the turbine outlet water and hydraulic function,and has nothing to do with the parameters such as the diameter of the runner.In addition,the combination of finite element simulation and experimental verification proved the correctness of the calculation model.This subject is to further change the internal flow regime of high-pressure water impingement turbines.Design different inlet jet diameters and change the relative position of nozzle and impeller.In addition,the influence of nozzle size and guide vane structural parameters on water flow and energy efficiency was studied by changing the size of the guide vane gap.Finally,the mechanism that affects the flow of turbine water is revealed,and the structural design parameters of the turbine with higher energy efficiency are explored.?2?Sensitivity analysis of capacitation and buckling strength.This subject uses the one-way fluid-structure interaction theory to extract the results of the flow field analysis as the mechanical load for the buckling analysis of the turbine.This project uses the Static Structural and Eigenvalue Buckling modules to conduct joint finite element simulation analysis of turbine guide vanes.Finally,the local buckling law of the vane surface under the impact of high-pressure jet is obtained.The purpose of this subject is to further analyze the sensitivity of turbine capacitation and buckling strength.Explore the buckling strength and energy efficiency of turbines with different runner sizes and vane notch shapes.In order to study the surface buckling morphology of the guide vane,monitoring points are set on the surface of the guide vane.Parametric research and monitoring of the guide vane buckling change law and energy harvesting efficiency characteristics are performed.?3?Experiment of high-pressure water bucket type water flow impact on new prototype.In addition,the high-speed camera design and image processing technology are used to analyze the flow pattern in the turbine cavity when different incident water pressure impacts the inner surface of the impeller.Moreover,test the efficiency of the whole machine under different turbine diameters.Finally,the change law of the energy efficiency of the turbine under different impeller gap sizes is summarized theoretically.First of all,the research innovatively proposed to improve the traditional open bucket type turbine into a miniature closed bucket type impact turbine.Second,the research boldly and innovatively transformed large hydropower plants into miniature,pipeline-embedded turbines.Secondly,due to the small size of the device,the guide vanes have been modified.This subject is to improve the design by increasing the thickness of the guide vane,removing the water splitting blade in the middle of the guide vane,and the new dimension of the notch of the guide vane.Finally,the study innovatively investigates the feasibility of using micro-bucket turbines to generate electricity in high-pressure water pipes.In addition,it provides a reference for the development of future residual voltage power generation technology.The results show that,in comparison,the capacity efficiency of the bucket-shaped guide vanes with a triangular notch is about 2%higher than that of the bucket-shaped guide vanes with a rectangular notch.Therefore,in the miniature high-pressure jet water bucket turbine,the design with the triangular shape of the gap selected has better energy efficiency.Compared with a turbine with a guide vane diameter of 150 mm,a turbine with a guide vane diameter of D=320 mm performs better.The best capacity of the capacity is about 29%.With the same diameter and flow,the power generation is positively related to the flow ratio and pressure difference ratio between the outlet and the inlet.When the pressure difference is greater than 2 MPa and the flow rate is greater than 20 m³/d^-1,the power generation will exceed 180W.In addition,the average conversion efficiency of pressure energy-electricity is above 27%,which can meet the demand for electricity.